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Testing mechanisms underlying the Hedley sequential phosphorus extraction of soils by Anika Klotzbücher; Klaus Kaiser; Thimo Klotzbücher; Maximilian Wolff; Robert Mikutta is a Agricultural and Biological Sciences article available to read on EtoBox.

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## Abstract The Hedley fractionation has become the preeminent measure for estimating the bioavailability of phosphorus (P) in soils. However, mechanisms underlying P extractability have never been tested. We hypothesize that P sequentially extracted by individual steps can either be referred to a specific mineral source (Hypothesis 1) or to its binding strength to minerals (Hypothesis 2). We prepared mineral‐P associations in the laboratory using various secondary mineral phases and P forms (orthophosphate, phytic acid, ribonucleic acid), which were then subject to the Hedley sequential extraction scheme (anion exchange resin in form, 0.5 M NaHCO~3~, 0.1 M NaOH, 1 M HCl, and concentrated HCl at 80°C). Extracts were analyzed for P as well as for the main mineral‐borne elements by inductively coupled plasma–optical emission spectroscopy (ICP–OES). In order to test if the observed mineral dissolution patterns match those of natural soils, we applied the Hedley fractionation to forest soils comprising various P stocks and measured in addition to extracted P also iron, aluminum, and calcium by ICP–OES. Phosphorus extractability from mineral‐P associations differed between P forms and m

Who reads Testing mechanisms underlying the Hedley sequential phosphorus extraction of soils?

Author

Anika Klotzbücher; Klaus Kaiser; Thimo Klotzbücher; Maximilian Wolff; Robert Mikutta

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); Wiley-VCH Verlag; John Wiley & Sons Ltd.; Wiley - V C H Verlag GmbbH & Co.; Wiley (ISSN 0366-2136)

Published

2019

Language

EN

Field

Agricultural and Biological Sciences (Life Sciences)